commit 180f2319663d6aece02fc0284a02944ad2cc7c98
Author: Tony Luck <tony.luck@xxxxxxxxx>
Date: Fri Jun 27 14:04:21 2008 -0700
[IA64] Bugfix for system with 32 cpus
On a system where there are no hot pluggable cpus "additional_cpus"
is still set to -1 at the point where we call per_cpu_scan_finalize().
If we didn't find an SRAT table and so pick the default "32" for the
number of cpus, when we get to:
high_cpu = min(high_cpu + reserve_cpus, NR_CPUS);
we will end up initializing for just 31 cpus ... and so we will
die horribly when bringing up cpu#32.
Problem introduced by: 2c6e6db41f01b6b4eb98809350827c9678996698
"Minimize per_cpu reservations."
Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 4ae15c8..632cda8 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -547,7 +547,8 @@ setup_arch (char **cmdline_p)
# ifdef CONFIG_ACPI_NUMA
acpi_numa_init();
per_cpu_scan_finalize((cpus_weight(early_cpu_possible_map) == 0 ?
- 32 : cpus_weight(early_cpu_possible_map)), additional_cpus);
+ 32 : cpus_weight(early_cpu_possible_map)),
+ additional_cpus > 0 ? additional_cpus : 0);
# endif
#else
# ifdef CONFIG_SMP
--
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